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A.46 Answers to Odd-Numbered Problems 57. (a) 23. 520 m/s 2 27. 13.5 N 2 (b) time interval (period) and force (tension) 37. 55.1 Hz the dot product of the given equation with each one of iˆ, jˆ, 47. ! 1 min 49. (a) (3.33iˆ) m/s (b) $ 5.48 cm (c) 0.667 m, 5.00 Hz (d) 11.0 m/s 51. 0.456 m/s 1/2 (b) L/4 63. 3.86 ! 10 $ 4 65. (b) 31.6 m/s 67. (a) (b) (c) 69. (a) & 0 ( (& L $ & 0 )x/L CHAPTER 17 1. 5.56 km 11. (a) 2.00 &m, 40.0 cm, 54.6 m/s (b) $ 0.433 &m (c) 1.72 mm/s 13. /P % (0.200 N/m 2 ) sin(62.8 x/m $ 2.16 ! 10 4 t/s) 15. 5.81 m 2 (b) 0.600 W/m 2 23. (a) 2.34 m and 0.390 m (b) 0.161 N/m 2 for both notes (c) 4.25 ! 10 $ 7 m and 7.09 ! 10 $ 8 m (d) The wave- lengths and displacement amplitudes would be larger by a 25. (a) 1.32 ! 10 $ 4 W/m 2 (b) 81.2 dB e $ 2bx &0 3 2k
A 0 2 &0 3 2k
A 0 2 e $ 2bx √ 2
" 0 (b) (c) T % 2"g $ 1/2 [L i ( (dM/dt)t/2#a 2 ] 1/2 59. f % (2"L) $ 1 (gL ( kh 2 /M) 1/2 61. (b) 1.23 Hz board bumps can excite a resonance vibration of the bike, !10 1 m 73. For * max % 5.00° there is precise agreement. For * max % 100° there are large differences, and the period is 23% greater than small-angle period. 75. (b) after 42.1 min CHAPTER 16 1. y % 6 [(x $ 4.5t) 2 ( 3] $ 1 3. (a) left (b) 5.00 m/s 11. (a) 3.77 m/s (b) 118 m/s 2 13. (a) 0.250 m (b) 40.0 rad/s (c) 0.300 rad/m (d) 20.9 m (e) 133 m/s (f) (x 15. (a) y % (8.00 cm) sin(7.85x ( 6"t) (b) y % (8.00 cm) sin(7.85x ( 6"t $ 0.785) 17. (a) $ 1.51 m/s, 0 (b) 16.0 m, 0.500 s, 32.0 m/s (c) (0.100 m) sin(3.14x/m $ 3.14t/s) 21. 80.0 N dT dt % " (dM/dt) 2#a 2 g 1/2 [L i ( (dM/dt)t/2#a 2 ] 1/2 h L i L a |